TURNTABLE Russian patent published in 1994 - IPC

FIELD: turntables of earth-moving and hoisting machines. SUBSTANCE: turntable includes upper rail ring 1 and lower rail ring 2 with supporting surfaces, main inserts 3 and 4, additional inserts 5 with two concave cylindrical surfaces 6 and 7 whose symmetry axes are mutually perpendicular and located in parallel planes. Additional inserts 5 are installed for interaction with their cylindrical surfaces 6 and 7 with inserts 3 and 4 that provides for maintaining constant area irrespective of deformation of rail rings. Inserts on one rail ring, e.g., ring 1 is attached radially. Inserts 4 have stops to prevent sliding off additional inserts 5. Inserts 3 and 4 and additional inserts 5 are made of polymeric material, or of coated metals. Design makes it possible to redistribute loads acting on turntable in occurrence of longitudinal and transverse deformations in two mutually perpendicular planes caused by forces arising in various operations of machine working cycle. EFFECT: prevented point contact between members of turntable due to redistribution of load in occurrence of longitudinal and transverse deformations of rail rings. 3 dwg